I dont think that this can be solved with just using relations on the actual timestamps.
So to solve this I ended up with adding a row field that i populate with serial numbers and then base my relations on that.
And i got a second problem, trying to calculate the effective timestamps, i need to compare with the the related previous timeLogs ditto, and FileMaker see's this as trying to have a calculation that is based on itself, even if its in another TO. So i had to make an autoenter calculation instead.
So all in all this make the solution not very dynamic.
But when you push the button It seem's to come up with the right result.
...... Well the site was not responding, so I used the time to figure out a way to make it dynamic, and thought that a Custom funtion should do the trick.
So I added a custom function to the solution, leaving the rest as it was, a bit messy to look at, but hopefully it can helpyou figure out the mechanics.
The custom function dosnt need any of the ekstra fields, besides the result field.
--- been thinking - the current Custom function is way to error prone, if there is missing some of the timestamps, the result will be invalid.
Sorry I wont have time until late sunday to make a new one.
OverlappingTimes_Demo_v3.fp7.gz